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APLICAÇÃO DO OPERADOR DE FRAGMENTAÇÃO ASSIMÉTRICA (FA) NA CARACTERIZAÇÃO DE CONTROLES GEOMORFOLÓGICOS EM RESERVATÓRIOS HIDROELÉTRICOS

2004; Sociedade Brasileira de Geologia; Volume: 34; Issue: 4 Linguagem: Inglês

10.25249/0375-7536.2004344501508

2177-4382

ARCILAN T. ASSIREU, JOÃO A. LORENZZETTI, EVLYN M. L. NOVO, JOSÉ L. STECH, CLÁUDIA Z.F. BRAGA, IVAN B. TAVARES DE LIMA,

Geochemistry and Geologic Mapping

This paper proposes the use of the Asymmetrical Fragmentation Operator (FA) to characterize geomorphologic controls affecting hydroelectrical reservoirs. Landsat-TM images were used to map reservoirs flooded surface. The FA operator was applied to vector files describing reservoirs shape to compute the average FA for each reservoir. The reservoir database was then classified according to reservoirs hydrographic basin and reservoirs size. The FA values were compared to the Shoreline Development Index (D) and to the reservoirs primary productivity data available in the literature. Results show that the FA is able to detect high-resolution geomorphologic features, which are not detected by D. Preliminary results show also that there is a significant relationship between FA and the primary productivity. This fact, however, does not hold for D. Moreover, FA showed no sensitivity to reservoirs size, being more responsive to their position in the cascade system, and therefore to the hydrographic basin geomorphology.